The perimeter of an equilateral triangle is 186 cm. what is the length of one side of the triangle?

I’m confused on how to work the pie charts

Monitors manufactured by tsi electronics have life spans that have a normal distribution with a standard deviation of 1800 hours and a mean life span of 20,000 hours. if a monitor is selected at random, find the probability that the life span of the monitor will be more than 17,659 hours. round your answer to four decimal places.

What is the surface area of the sphere?